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Placer Mining Methods

Managing boulders on your gold placer mining cut.

A lot of placer mines have a high percentage of boulders in the pay streak.

One of the ways to manage these is to use them to your advantage. I like to stack them up on the side of the next cut. The reason for this is to essentially build a rock retaining wall for the purpose of clearly defining your next cut as you strip down to it.

Placer Mining Methods

This also helps keep dilution of the pay gravels from the overburden by using these boulders as a wall. Boulders are much easier to rake out and simply throw them back into your worked pit. I also like to use discarded stumps and trees along the edge if I have to. These can be a bit messy to work with, and the wood can come back to haunt you in your settling pond with the duff and tree bark plugging your intake screens if you are recirculating your water. This is something to keep in mind.

Placer Mining Methods

Materials management is the number one priority on any placer mining project.

Project management of placer operations in materials management is so important to the success of an alluvial mining project.


You can see here we are setting up the pit for the last lift of a cut to strip off the remaining 18 ft of overburden. Overburden will swell as much as 50% and can cause havoc if you do not plan accordingly.

All gravel and overburden has a swell factor and you will come to grips with that in short order after you handle your material a few times. Your screen analysis is usually a pretty good baseline and you need to learn to trust those numbers, then adjust accordingly.

Every operator must share any discoveries you find during the shift as far a boulders, tight gravel or any other operating difficulties you may encounter. As a mine manager you need to study each and every detail that your crew is encountering and plan ahead for any anomalies that your mining plan may encounter. Just when you think you have it all under control there is always something that comes out to bite you. Weather, ground water, materials consistency, even manpower fatigue. You must as a mine manager stay multifaceted to every detail and stay on it and do not become complacent.

Overburden management takes experienced operators and management.

I was stripping some deep ground I had some years back. My two D-8's blade to blade pushed 25 to 30 yards a cycle.

Placer Mining Methods

I also had a D-9G and we set the D-8s on both sides and were pushing 60 yards plus on the downhill runs per cycle.

The overburden ratio to pay gravel was up to 20 to 1.

Overburden management is the key focus and number one priority to get it right. You have to have experienced operators and management, hands on at all times to keep it in balance. You have to keep pay gravel going to the plant in accordance to your overall mining plan.

~ Rob Towner

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Our company engaged Rob Towner to do the final setup and complete the wash circuit of our pilot plant to begin a feasibility study of an ancient mining district gold concession in Mexico, in order to construct a full scale modern mining operation that will eventually run 4000-5000 tonnes per day or pay ore. Rob is without question one of the most knowledgeable, and talented miners on the planet. His experience and know-how benefited our mining team tremendously and he worked right along side our crew. His work ethics are as high as I have ever seen and he gets the job done. We were right on schedule, never missed completing the days work and finished on budget and on time. Many thanks Rob, you're our favorite Montana Mining Gringo. Best wishes from our mine to yours.
Merv, Mexico
I have had Rob assist me on a number of occasions with my gold mining. When nobody else can fix it or figure it out, Rob jumps in and seems to put it all together so that what is stopped or busted starts working. I would never have got my wash plant at my mine working without his help. He knows how to keep the pay dirt being processed in the plant. I have seen him build stuff and weld stuff to get something fixed that seemed impossible but he gets 'er done just fine. Rob can read the ground like no one I have ever seen, he has thousand of ounces under his belt and my experiences with him show it. He has helped me setup my mine and plant in many different regards. I consider myself lucky I ran into Rob.
Jack, Montana
You and Les are top shelf. Thanks for all your help. I like how you guys operate.
John, Bering Sea
Montana Tech, said you where the Yoda of this gold stuff. My brother and I got a 100 acre gold claim......
Rod, Montana